|Publication number||US5268923 A|
|Application number||US 07/929,132|
|Publication date||Dec 7, 1993|
|Filing date||Aug 13, 1992|
|Priority date||Aug 29, 1991|
|Also published as||DE4128776A1|
|Publication number||07929132, 929132, US 5268923 A, US 5268923A, US-A-5268923, US5268923 A, US5268923A|
|Inventors||Wolfgang Welsch, Hans Krueger, Klemens Huener, Guenter Kellerer, Rudolf Haeusler, Joerg Moehnle, Peter Geschka|
|Original Assignee||Siemens Aktiengesellschaft|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (10), Classifications (6), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention is directed to a mirror mount for a gas laser, particularly a HeNe gas laser. The mirror mount contains a mirror receptacle, which is composed of a material having a coefficient of thermal expansion matched to that of the resonator mirror, and the mirror receptacle at least partially embraces a resonator mirror and is attached to a tube having a coefficient of thermal expansion differing from that of the mirror receptacle so that the mirror is in axial alignment with the tube.
U.S. Pat. No. 5,054,032, whose disclosure is incorporated herein by reference thereto and which claims priority from German Application 39 17 744, discloses a mirror mount with two parts. The U.S. Patent discloses a cylindrical mirror mount, which is manufactured of steel and another part surrounding the mirror, which is manufactured of a material having a coefficient of thermal expansion matched to that of the mirror. The material of the part surrounding the mirror, however, is difficult to process by machining and, thus, requires a long processing time. Also, disturbing burrs will occur during the machining or processing steps.
It has already been proposed elsewhere to fabricate the mirror mount of a steel tubing, introduce the mirror into an end region of a co-enlarged inside diameter of the steel tubing and to solder it with glass solder at the circumference. This embodiment requires a relatively complicated annular part, since the glass solder must be prevented from running so that a brake for the flow of the glass solder in the form of a diameter step and an uncut portion must be provided. This means considerable cost during manufacture.
The object of the present invention is to provide a mirror mount for a gas laser, which mirror mount contains a mirror receptacle composed of material having a coefficient of thermal expansion matched to that of the resonator mirror, the mirror receptacle at least partially embracing the resonator mirror and being mounted on a tube having a coefficient of thermal expansion differing from that of the mirror receptacle, with the mirror being axially aligned with the tube, which mirror mount can be manufactured in a simple manner.
This object is achieved by improvements in a mirror mount for a gas laser, particularly a HeNe laser, said mirror mount containing a mirror receptacle composed of material having a coefficient of thermal expansion matched to the coefficient of thermal expansion of the resonator mirror, the mirror receptacle at least partially embracing the resonator mirror, said mirror receptacle being joined to a tube having a coefficient of thermal expansion differing from that of the mirror receptacle to place the mirror in axial alignment with the tube. The improvements are the mirror receptacle having a holding region for embracing the mirror and a spacer region, said spacer region defining a distance of the mirror from the tube, the mirror receptacle being deformable in a radial direction so that mechanical stresses that occur between the tube and the mirror receptacle, as a consequence of temperature fluctuations occurring during both manufacturing and during operation of the laser, will not produce any damage to the mirror or to the connection between the mirror and mirror receptacle.
The mirror receptacle of the present invention can be manufactured by stamping or punching and include a deep drawing step. Thus, the manufacturing steps avoid any hollowing-out of the region for the mirror by a machining process.
An embodiment is advantageous wherein the mirror receptacle is composed of a sheet metal ring in which the retaining portion is fashioned as an outer flange ring and the spacer region is fashioned as an inner flange ring and wherein both flange rings are joined to the tubing mechanically firmly and vacuum-tight at a distance from the point of contact with the mirror. The tubing, therefore, advantageously has a higher coefficient of thermal expansion than the mirror receptacle and has an edge or end region overlapping the mirror receptacle in an axial direction so that the mirror receptacle presses against this end region. The distance between the outermost contact location between the tubing and the mirror measured along the mirror receptacle should not fall below a value of 0.5 mm given a wall thickness of 0.3 mm in the holding region. It is thereby advantageous when the tubing and the mirror receptacle are joined to one another with a surface soldering. An embrittled zone is thereby avoided and the extremely short distance between the end of the tube and the mirror will remain elastic.
Advantageously, the holding region of the mirror receptacle covers the spacer region in a radial direction. As a result thereof, an extremely short mirror receptacle occurs. A mirror receptacle that is simple to manufacture is established in that the spacer region and the holding region adjoin one another in an axial direction. Another advantageous embodiment is established in that the distance between the end of the tubing and the mirror amounts to approximately 1.3 mm and in that the end region of the tubing is soldered to the holding region of the mirror proceeding from the outside.
Advantageously, the tubing is composed of steel and the mirror receptacle is composed of a nickel/iron alloy having a coefficient of thermal expansion adapted to that of the mirror. An example of such an iron-nickel ally is commercially available under the tradename VACOVIT.
Other advantages and features of the invention will be readily apparent from the following description of the preferred embodiments, the drawings and claims.
FIG. 1 is a cross sectional view of a mirror mounted in accordance with the present invention;
FIG. 2 is an enlarged partial cross sectional view of one embodiment of the mirror mount;
FIG. 3 is a partial cross sectional view of a second embodiment of the mirror mount; and
FIG. 4 is an enlarged partial cross section of a third embodiment of the mirror mount in accordance with the present invention.
The principles of the present invention are particularly useful in a mirror mount illustrated in FIG. 1. As illustrated, a tube 1 of a mirror mount carries a mirror receptacle 2 that holds and centers the resonator mirror 3. The mirror receptacle 2 is constructed of a thin-wall material wherein the coefficient of thermal expansion of the mirror receptacle is adapted to that of the resonator mirror 3.
As illustrated in FIG. 2, the mirror receptacle 2 has a holding region 4 pressing against an outer circumference of the mirror 3, and this holding region 4 is joined to the mirror 3 thereat with a material bond. The holding region 4 lies on a flange ring 5 that is joined at one end to a spacer region 6 by a reversed bend 7. The flange ring 5 is soldered to the tube 1 at the bend 7, which forms a solder location 7. As illustrated, the spacer 6 is also a flange ring that extends radially inward from the ring 5.
According to the embodiment of FIG. 2, a solder ring 9 is introduced into a recess 10, which is on the end face of the tube 1. The ring 9 is melted in a surface soldering and produces a soldered connection between the tube 1 and the mirror receptacle 2. The spacer 6 presses against the mirror 3 and defines the minimum spacing of the mirror from the end of the tube 1. Given the arrangement of FIG. 2, the wall thickness is at most 0.3 mm for the mirror receptacle, and the minimum spacing between the mirror 3 and the tube end lies at approximately 0.5 mm. Here, the recess 10 only serves the purpose of accepting the solder ring 9, and its depth, therefore, lies on the order of magnitude of the wall thickness of the solder ring 9.
In the embodiment illustrated in FIG. 3, the tube 1a has a deeper recess 12 on its end face 11. The mirror receptacle 2a is axially centered by a step 13 formed by the recess 12 in the end face 11 of the tube 1a. A solder ring 8 enables soldering to proceed from the outside. The distance in an axial direction between the end face 11 of the tube 1a and the mirror 3 amounts to at least 1.3 mm in this example in order to keep an adequate part of the flange ring 5, at least the region 4, elastic despite embrittlement in the region of the solder location. As illustrated, the spacer 6a has a portion parallel to the flange ring 5 and is concentrically arranged therein.
The embodiment of FIG. 4 shows a mirror receptacle 2b that is especially simple to manufacture, wherein the flange ring 5b and the spacer 6b extend in the same direction and are interconnected by a radial shoulder portion 16. The mirror 3 will lie on the shoulder portion 16 as it is held by the holder region 4 of the flange ring 5. The shoulder 16 is a radial step and its distance from an end region 14 is determined by the axial length of the spacer 6b. The end region 14 of the spacer 6b is received in a recess 15, which is formed at an end face 11 of the tube 1b. This recess 15 will center the end region 14, which is soldered to the end face 11 by a solder ring 8.
Although various minor modifications may be suggested by those versed in the art, it should be understood that we wish to embody within the scope of the patent granted hereon all such modifications as reasonably and properly come within the scope of our contribution to the art.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6480517||Feb 22, 2000||Nov 12, 2002||Tuilaser Ag||Shadow device for a gas laser|
|US6493375||Feb 22, 2000||Dec 10, 2002||Tuilaser Ag||Adjustable mounting unit for an optical element of a gas laser|
|US6522679||Feb 22, 2000||Feb 18, 2003||Tuilaser||Gas laser discharge unit|
|US6577457||Aug 10, 2000||Jun 10, 2003||Nikon Corporation||Catadioptric lens barrel structure having a kinematic alignment structure and method for aligning two planar surfaces|
|US6603790||Feb 22, 2000||Aug 5, 2003||Hans Kodeda||Gas laser and a dedusting unit thereof|
|US6782029||Feb 22, 2000||Aug 24, 2004||Tuilaser Ag||Dedusting unit for a laser optical element of a gas laser and method for assembling|
|US6804284||Feb 22, 2000||Oct 12, 2004||Tuilaser Ag||Optical element holding and extraction device|
|US6859482||Feb 22, 2000||Feb 22, 2005||Tuilaser Ag||Modular gas laser discharge unit|
|US20040254567 *||Feb 12, 2004||Dec 16, 2004||Holz Frank G.||Surgical method for ablating tissue|
|EP1130698A1 *||Feb 21, 2001||Sep 5, 2001||TuiLaser AG||Optical element holding and extraction device|
|U.S. Classification||372/107, 372/65, 372/61|
|Aug 13, 1992||AS||Assignment|
Owner name: SIEMENS AKTIENGESELLSCHAFT, A GERMAN CORP.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:WELSCH, WOLFGANG;KRUEGER, HANS;HUEBNER, KLEMENS;AND OTHERS;REEL/FRAME:006245/0385
Effective date: 19920728
|Jul 15, 1997||REMI||Maintenance fee reminder mailed|
|Dec 7, 1997||LAPS||Lapse for failure to pay maintenance fees|
|Feb 17, 1998||FP||Expired due to failure to pay maintenance fee|
Effective date: 19971210